C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Electrical
Not Logged In! Login or Register!  Users Online: 10 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
VetteBookStore.com
CorvetteClothing.com
Mid America Motorworks
Bair's Corvettes
Volunteer Vette Products

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
TREY 03
Gene
Featured Links

Buy Now
Corvette Fuel Injection & Electronic Engine Control: 1982 through 2001
Corvette Fuel Injection & Electronic Engine Control: 1982 through 2001


Corvette from the Inside
Corvette from the Inside


Corvette Fifty Years (Hardcover)
Corvette Fifty Years (Hardcover)


The Corvette Factories: Building America's Sports Car (Hardcover)
The Corvette Factories: Building America's Sports Car (Hardcover)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
1/19/14 12:03am - Original Message: 'How to test your Ameter....'
HighDesertDave
Former Member
- Send Private Message


Carson City, NV - USA

Vette(s):
Numbers matching 1972 350 4 speed, silver pewter body with blue interior

Joined: 12/4/2013
Posts: 239
Is there a way to test an ameter without the engine running? Mine does not work (it was dead when I bought the car). I've got the dash/center gauge cluster/console torn down and figured it would be a good time to replace the ameter but I should have made sure it was getting juice before I broke the interior down. Can I pop it out and run jumpers from a running car to it? Please tell me how to wire it that is possible. Or can I test it with a multi meter?
Thanks,
Dave 

____________________________________
My Christmas present to ME! Bought Sat 11-30-2013. 72, 350 4 spd, Silver with blue interior...Can't you just hear Pablo Cruz playing in the background?

 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
1/19/14 8:35am - Reply: 'Re: How to test your Ameter....'
jimiam
Former Member
- Send Private Message


Memphis, TN - USA

Vette(s):
1981 Red 1993 Black Rose

Joined: 2/16/2007
Posts: 134
The easiest way to check would probably be with a multimeter that has at LEAST a 20A or more scale. Finding a source for a load could prove a problem. A battery charger which outputs 20--30A would work. Find a 12v car or marine battery with a low charge and hook up your battery charger with your multimeter and the car ammeter in series and charge the battery, then just check the ammeter against your multimeter. (remember? most battery chargers have an ammeter built in) Be sure to tighten the nuts tightly on the ammeter your testing and remove it from the vette. Wink

jim




|UPDATED|1/19/2014 6:35:24 AM (AZT)|/UPDATED|


____________________________________

(click to see a bigger image)
 Reply Reply  Quote Reply w/Quote
1/19/14 3:00pm - Reply: 'Re: How to test your Ameter....'
rraider1
Former Member
- Send Private Message


Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152

Keep in mind That the amp meter in our cars are GM galvanometer that measures the voltage difference between the horn relay and the starter


By referring to the above diagram, it can be seen that the ammeter reads the difference in voltage between the battery and the alternator. The wire that goes directly from the battery to the alternator and appears to short out the ammeter is a meter shunt. What the ammeter actually reads is the voltage drop across this wire. The resistance of this wire is about 0.1 ohm. There is no physical resistor in the circuit, the resistance is due to the length of the wire required to get from the starter solenoid to the horn relay around the engine bay. The horn relay is not in the ammeter circuit but is a convenient connection point for the alternator output alternator. When the output voltage of the alternator is greater than battery voltage, the ammeter shows a charge proportional to the difference in voltage. When the battery comes up to full charge, the ammeter drops to near zero. If the output of the alternator is less than the battery voltage, as under a heavy load, the ammeter will show a discharge proportional to the difference in voltage

You can test the gauge with a discharged AA Battery by hooking it up to the gauge






|UPDATED|1/19/2014 1:00:05 PM (AZT)|/UPDATED|


____________________________________
Bob R
 Reply Reply  Quote Reply w/Quote
1/19/14 2:57pm - Reply: 'Re: How to test your Ameter....'
rraider1
Former Member
- Send Private Message


Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152

Take a look at this post


http://forums.corvetteforum.com/c3-tech-performance/3405247-inop-amp-gauge.html



____________________________________
Bob R
 Reply Reply  Quote Reply w/Quote
1/20/14 1:14am - Reply: 'Re: How to test your Ameter....'
HighDesertDave
Former Member
- Send Private Message


Carson City, NV - USA

Vette(s):
Numbers matching 1972 350 4 speed, silver pewter body with blue interior

Joined: 12/4/2013
Posts: 239
Don't ya just love the power of a forum? Thanks guys, with that info, I should be able to determine where the failure lies. Dave

____________________________________
My Christmas present to ME! Bought Sat 11-30-2013. 72, 350 4 spd, Silver with blue interior...Can't you just hear Pablo Cruz playing in the background?

 Reply Reply  Quote Reply w/Quote
1/21/14 12:33pm - Reply: 'Re: How to test your Ameter....'
rmendoza
Former Member
- Send Private Message


Colorado Springs, CO - USA

Vette(s):
'68 (2), '75 (2), '86, '90, '98 (2), '06 (2), '10, '12 GS, '82 Collector Edition, '03, '90 C4 ZR-1

Joined: 10/11/2013
Posts: 108
My amp meter slighly fluctuates plus or minus of center.  Does this indicate proper operation?  I just purchased my '68 in Oct. and recently joined C3VR.
 
I agree with the statement about the power of C3VR.  Quite frankly with the technologies going into the cars, it is becoming harder and harder to find someone competent to work on our older cars.  This type of information allows me to take a shot at fixing some of this stuff, while knowing the C3VR has my back!!!


____________________________________

God  Bless, rick

'75 Steel Blue Stingray Convertible
'90 Bright Red C4 ZR-1
 
  
 Reply Reply  Quote Reply w/Quote
1/21/14 12:56pm - Reply: 'Re: How to test your Ameter....'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
An amp meter will show more movement during operation than a volt meter, so some minor fluctuations are "normal". As the voltage regulator kicks in/out, you will notice that surge on an amp meter, but not so much on a volt gauge. As long as the needle isn't sweeping far to left/right of center, that is. If you turn your headlights on, you'll see the amp meter bounce much more than you would with a voltmeter. Approve


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Electrical
(Moderator: Adam Wartell, Norsky, Adams' Apple)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30